Guaranteed funds rank among most conservative investments of collective investments. They are good for investors who prefer certainty (demand guaranteed yield) connected with a lower yield, which is typical for guaranteed products, to the opportunity to invest in potentially more yielding open shares funds without guarantee. Unlike other categories of shares funds, the maturity of the guaranteed funds is defined by the Fund Statute. They assure/guarantee investors that at the end of the investment period they will be paid at least the value of the initial investment, even if the development on capital markets is unfavourable. If capital markets grow, the investor will participate in their development. Guaranteed funds offer medium-term up to long-term investments, the duration/maturity of the funds is normally from 3 to 5 years. The return on the amount invested is assured on the fund maturity, during the investment duration the product can be sold for its market price, which can fluctuate in time.